Credit: AP

Green Bay Packers tight end Andrew Quarless, right, picks up yardage in front of Indianapolis Colts offensive tackle Michael Toudouze during the first quarter of an NFL preseason football game in Indianapolis, Friday, Aug. 26, 2011.

SANTA CLARA, Calif. - Covering tight ends is one of the few flaws in the 49ers defense, and it's been exposed all season.Of 19 receiving touchdowns allowed, eight have come by tight ends, including one in each of the past four games.Why are the 49ers struggling against tight ends?"I'm not sure. I can't say it's been actually that horrific," linebacker Patrick Willis responded. "But it is what it is."

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